GEMS is used to simulate the MIMO antenna that includes two PIFA antennas. The antenna is relatively thin compared to its dimensions in the horizontal directions (550:1). GEMS allows you to use a flat domain and achieve the accurate results. The output parameters are MEG, ECC, S-matrix, total active reflection coefficient, and far field patterns. In this showcase, we also compare the simulation result using the large, mediate and small domains in the z-direction.

The basic design procedure in the simulation:

Draw the substrate first and then assign the dielectric material to it

Draw an “F” shaped structure

Draw a ground and assign it to be PEC

Draw a via at one end of the PIFA

Draw a line between another end of the PIFA and the ground, and assign it as a lumped port. Assign its group ID to be “1”

Select the PIFA, probe and lumped port, and click on the Mirror button in the toolbar to generate an image about the symmetric plane.

Change the group ID of the imaged lumped port to “2”

Check the “Output far field pattern for each excitation” in the far field parameter setting window